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Medium and Heavy Trucks

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I have a 2007 CNH TC30 that won't shut off sometimes. When…

I have a 2007 CNH TC30 that won't shut off sometimes. When it is off I can hear somethings clicking like the engine stop solenoid.

Mechanic's Assistant: What is the complete model and serial number of your machine?

I just replaced the safety start relay today and it was clicking randomly while I was doing some other maintenance

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

TC30, Z6NGC1037

Submitted: 1 year ago.Category: Medium and Heavy Trucks

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Customer reply replied 1 year ago

When it starts doing this they key can be in the run or off position and it will not shut off no matter what I do. I've tried engaging the mid and rear PTO's and standing up, turning on the lights (read it in a blog), leaving it in gear (HST) and standing up (no buzzer), but nothing work. The front hydraulics, PTO's, transmission, and lights all work with key off. I haven't paid attention to the instrument cluster much, but I believe all the gauges and lights shut off. I'm guessing it's the fuel shutoff solenoid (cheapest), ignition switch, or safety controller (most expensive).Oh, so far I haven't been able to get to the fuel shutoff switch before it shuts down on its own. Sometimes it'll start to die and then rev back up and keep going.

Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.

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With engine off, use a voltmeter and check the harness to the fuel solenoid with the key on. It has to have voltage when key is on, and none when key is off. Fuel solenoid usually causes no start, not problem killing engine! If you find voltage at he solenoid with key off, either keyswitch is bad, or there is back-feed from elsewhere, maybe a bad voltage regulator.

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Customer reply replied 1 year ago

I don't see a voltage regulator on my wiring diagram. I also don't see the Safety Controller on my diagram but I know it's on my firewall. I said fuel shutoff solenoid, but my diagram lists it as engine shutoff solenoid. Not sure if that makes a difference.Or is the voltage regulator in the alternator?

The fuel shutoff solenoid and engine shutoff are the same. It has to retract for start, and has to snap back when key is turned off. See link below. The regulator is in the alternator and if regulator has a bad diode, you can get feedback into the electrical system.

A new voltage regulator is $344. A remanufactured alternator is $231. A toggle switch in the PO.5 wire coming off the voltage regulator is less than $5. I know, eventually the regulator will burn out and I'll have to replace the alternator anyway, but it'll extend the time I have for my budget to recover from implement purchases.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.